If u do not experience any issue with your phone at the moment, then there is no need. Some users reports that they are losing internet connection with iOS 4.3.3 whereby sone users like me are enjoying the iOS 4.3.3
So if you don't have any major bug or battery issue with your phone i don't see the need to upgrade, but if you want to try out, it's your call, just make sure that you save your actuall iOS 4.3.2 shsh using tinyUmbrella to be safe, in case 4.3.3 turns out to be a nightmare.
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